I dont think TL requires seedbox. I usually download 20-50gigs remuxes from TL(freeleech), my download never seems to increase, easy upload at TL. The hardest i found are HD trackers, the likes of Blutopia, BeyondHD, etc which have very less freeleech torrents.

Personally i would say, try to get into TorrentDay or SceneTime for latest released content (as they require only 3 days seedtime). My personal favourite is TorrentBD (Bangladeshi tracker), as it too has very good pretimes on new content(they have everything related to Hollywood and latest EVO releases) and only 2 days seedtime and anything above 10gb is freeleech.
IPT requires freaking 2 weeks of seedtime
TL too requires 8 days of seedtime for PowerUsers.

IPT and TL can be used for rare or old content, because they always seem to have good seeders on it.
TorrentBD, torrentDay or Seedtime are good choices to start from (but IPT/TL definitely required for backup or rare content)